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Diodes Incorporated FCX493TA
- Part No.:
- FCX493TA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-243AA
- Datasheet:
-
FCX493TA.pdf
- Description:
- TRANS NPN 100V 1A SOT-89-3
- Quantity:
- Payment:
- Shipping:
Inventory:292,682
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Product details
Overview
FCX493TA from Diodes Incorporated is a 100V NPN medium-power transistor in SOT89 package, rated for 1A continuous collector current and featuring VCE(sat) < 300 mV at 250 mA. It delivers high-voltage switching capability with low saturation loss, used in solenoid and relay drivers within DC–DC modules and industrial load management circuits.
For engineers reviewing the FCX493TA datasheet, FCX493TA pinout, FCX493TA application, or FCX493TA equivalent, key selection criteria include its 100V VCEO, 1A IC, SOT89 thermal performance (RθJC = 16°C/W), complementary PNP pairing with FCX593, and automotive-grade variant FCX493Q availability.
Technical Context
This NPN bipolar junction transistor operates as a medium-power switch with fixed gain structure optimized for linear and saturated-mode control. Its BVCEO = 100 V and IC = 1 A rating support robust load switching in 24–48 V industrial systems, while low VCE(sat) minimizes conduction loss during on-state operation.
The device uses a thermally enhanced SOT89 package with exposed collector pad, enabling RθJC = 16°C/W and RθJL = 10.01°C/W - critical for power dissipation management in compact PCB layouts without heatsinks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 100 V - supports switching in 48 V nominal bus systems with 2× safety margin |
| IC (continuous) | 1 A - enables direct drive of solenoids up to ~12 W at 12 V |
| VCE(sat) | < 300 mV @ 250 mA - limits conduction loss to < 75 mW under typical load |
| hFE | 100–300 @ IC = 1–500 mA - ensures stable base drive design across operating range |
| fT | 150 MHz - supports fast switching up to ~100 kHz with minimal gain roll-off |
| RθJC | 16 °C/W - allows 625 mW junction-to-case power transfer before exceeding TJ = 150°C |
Pinout & Package
Package: SOT89 - surface-mount, thermally enhanced plastic package with exposed collector tab for PCB heat sinking. Dimensions per JEDEC TO-243AA; weight ≈ 0.052 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Collector (C) | Main current output path | Connected to exposed metal tab - must be soldered to large copper pour for thermal management |
| Emitter (E) | Current return path to ground | Low-impedance reference node; ties directly to GND plane in switching applications |
| Base (B) | Control input for transistor biasing | Requires current-limited drive (max IB = 200 mA) to ensure safe saturation |
Key Features
| Feature | Design Value |
|---|---|
| High breakdown voltage | VCEO = 100 V enables use in 48 V industrial power rails with margin |
| Low saturation voltage | VCE(sat) < 300 mV reduces power loss and self-heating in high-duty-cycle loads |
| Thermally optimized package | SOT89 with RθJC = 16°C/W supports 1 W dissipation with minimal board area |
| Complementary PNP pair | FCX593 available for push-pull or H-bridge configurations |
Applications
| Industrial Solenoid Control | DC–DC Converter Switch |
|---|---|
Use Scenario: Driving 24 V/500 mA solenoids in programmable logic controller (PLC) output modules. IC Role / Device Role / Timing Role: NPN switch controlling coil current path with TTL-compatible base drive. Use Value: Low VCE(sat) keeps coil power loss below 150 mW, reducing thermal stress on PCB traces. | Use Scenario: High-side switch in non-isolated buck converter feedback loop for 12 V → 5 V conversion. IC Role / Device Role / Timing Role: Medium-speed switching element handling 1 A peak inductor current at ≤100 kHz. Use Value: fT = 150 MHz ensures sufficient gain margin for stable gate-drive amplification. |
| Relay Driver Circuit | Actuator Interface Module |
Use Scenario: Controlling 48 V/300 mA electromagnetic relays in HVAC control panels. IC Role / Device Role / Timing Role: Saturated-mode switch providing isolated coil energization via optocoupler-driven base. Use Value: BVCEO = 100 V withstands relay coil flyback spikes up to 80 V without clamping diode. | Use Scenario: Bidirectional actuator interface in robotic joint controllers requiring dual-polarity drive. IC Role / Device Role / Timing Role: One half of complementary pair (with FCX593) forming discrete H-bridge output stage. Use Value: Matched hFE and VCE(sat) between NPN/PNP ensures balanced forward/reverse torque response. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN medium-power transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZTX450 | VCEO = 60 V, IC = 1 A, SOT89 package, hFE = 100–800 | Limited to ≤36 V systems due to lower breakdown rating | Select when 60 V rating suffices and higher hFE improves base drive efficiency |
| MJD112 | VCEO = 100 V, IC = 2 A, TO-252 package, RθJA = 60°C/W | Larger footprint and higher thermal resistance require heatsink for >500 mA continuous | Choose for higher current headroom where board space permits TO-252 mounting |
Compared with ZTX450 and MJD112, FCX493TA uniquely balances 100 V rating, SOT89 thermal efficiency (RθJC = 16°C/W), and low VCE(sat) - making it optimal for space-constrained 48 V industrial switches where thermal management is critical.
Availability
FCX493TA is available at Aetrix Electronics and suitable for industrial solenoid control, relay driver circuits, and DC–DC converter switches requiring stable component supply and RoHS-compliant manufacturing.
Supply support for FCX493TA includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability components for industrial, computing, and automotive markets.
The FCX493TA belongs to Diodes' medium-power bipolar transistor product line, engineered for ruggedized switching in industrial control and power conversion applications where voltage margin and thermal performance are critical.
FAQ
What is the maximum safe operating temperature for FCX493TA?
The FCX493TA has an operating junction temperature range of –65°C to +150°C. With RθJC = 16°C/W and PD = 1 W, sustained operation at full power requires case temperature ≤134°C. Derating begins above 25°C ambient per Figure 2 in DS33056 Rev. 8–2.
Does FCX493TA require a base resistor in standard switching applications?
Yes - a current-limiting base resistor is mandatory. For 1 A collector current and hFE ≥100, minimum base drive is 10 mA. With VBE(sat) ≈ 1.15 V and 3.3 V or 5 V logic drive, a 330 Ω or 390 Ω resistor ensures reliable saturation without exceeding IB = 200 mA absolute max.
How does FCX493TA compare to its automotive-grade variant FCX493Q?
FCX493Q meets AEC-Q101 requirements with extended temperature validation (–40°C to +150°C), tighter parametric screening, and PPAP documentation support. Electrically identical to FCX493TA, but qualified for automotive body electronics and under-hood modules where reliability certification is mandatory.
Can FCX493TA be used in linear amplifier configurations?
It is not recommended. While hFE and fT support small-signal amplification, the device is characterized and optimized for switching - with parameters like VCE(sat) and SOA defined under pulsed conditions. Linear operation risks thermal runaway due to lack of guaranteed safe operating area in continuous analog mode.
FCX493TA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-243AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 1 A
- Voltage - Collector Emitter Breakdown (Max):
- 100 V
- Vce Saturation (Max) @ Ib, Ic:
- 600mV @ 100mA, 1A
- Current - Collector Cutoff (Max):
- 100nA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 100 @ 250mA, 10V
- Power - Max:
- 1 W
- Frequency - Transition:
- 150MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-89-3
FCX493TA FAQ
1.How can I place an order for FCX493TA through Aetrix?
Please submit a Request for Quotation (RFQ) for FCX493TA on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for FCX493TA reliable?
The price and inventory of FCX493TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FCX493TA is usually 5 days.
3.What payment methods are accepted for FCX493TA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FCX493TA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FCX493TA?
FCX493TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FCX493TA order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for FCX493TA?
For technical support, including FCX493TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FCX493TA requirements.
6.How does Aetrix verify that FCX493TA is sourced from the original manufacturer or authorized distributors?
All FCX493TA products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that FCX493TA meets industry standards.
7.What is the process for return or replacement of FCX493TA?
All FCX493TA units undergo pre-shipment inspection (PSI). If there is an issue with FCX493TA, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The FCX493TA part is unused and in its original packaging.
Return procedure for FCX493TA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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